Burner control apparatus



Nam. 6, 1945. T. A. COHEN 2,388,388

BURNER CONTROL APPARATUS Filed Jan. 22, 1942 2 Sheets-Sheet l.

77) cede/1 INVENTOR,

av. 3945. T. A. COHEN 2538,38

BURNER CONTROL APPARATUS Filed Jan. 22, 1942 2 Sheets-Sheet 2 '77) e 0 do re 0A0? INVENTOR,

Patented Nov. 6, 1945 a t i t J:

mesne assignments,

to Wheelco Instruments Company, Chicago, IlL, a corporation of Kilinois Application January 22, 1942, Serial No. 427,795

Claims.

This invention relates to burner control apparatus, in general, and more particularly to an apparatus for preventing the slagging or clinkering of the furnace wall from preventing light or other operating rays from the furnace from reaching a radiation sensitive fiame supervisory device forming a part of a burner control apparatus.

In those burner control apparatus, which include a radiation sensitive iiame supervisory device which is adapted to receive flame or light radiations from the furnace so as to control safety apparatus and fuel supply in accordance with presence or absence of flame, it is important to prevent slagging, clinkering and other accumulations on the furnace wall and vicinity thereof from preventing rays of the proper character from reaching said device and the primary object of this invention is accordingly to provide means, in a burner control apparatus, which will so prevent such interference with the proper functioning of said device.

Other and further objects of this invention will become more apparent hereinafter as the same becomes better understood from an examination of the specification and claims in conjunction with the accompanying drawings, wherein:

Fig. 1 is a side elevation of a radiation sensitive device forming a part of a burner control apparatus-and provided with a mechanism embodying this invention;

Fig. 2 is a similar view in longitudinal section with the apparatus installed in a furnace wall; and

Fig. 3 is an enlarged detail schematic view of one form of automatic operating means for the mechanism shown in Figs. 1 and 2.

Referring to the drawings more particularly, reference character I is a sight tube or receiver for receiving rays from the interior of the furnace. A base plate 2 is rigidly attached to the tube l and pivotally carries a rod ll at a pivot 3,

The rod 4 has a spring 5 mounted thereon and has its outer end 1 extending through the upper end of an operating lever B.

An adapter cap 8 is fitted over the outer end of sight tube I and carries a radiation receiver 9, the latter including a radiation sensitive device 2c and socket 25 therefor forming a part of a burner control apparatus (not shown) for controlling fuel supply and other safety apparatus (not shown).

the rest of the control apparatus. The receiver 9 receives radiations through opening 9a. A readily removable glass slide 9b is provided for sealing A cable Ill electrically connects the radiation sensitive device 24 in the receiver 2 with oil the receiver 9 from foreign materials such as dust due to back draft. The opening 9a permits induction of a flow of air through the sight tube 1, due to the furnace pressure being lower than 5 atmosphere, to keep the tube cool and clean.

The lever 6 is pivoted at I! to a fixed arm IB integral with the plate 2; Said lever B is provided with a slot II for engaging a pin I2 which rides in a slot l3 in sight tube l. The pin I2 is at- 10 tached to a slag cutter tube 22 reciprocable in sight tube l which cutter tube 22 is provided with a cutting edge 23 in a plane at an acute angle to the axis of the tube, the forward or projecting edge being on top.

A pneumatic operator cylinder I6 is mounted on plate 2 and contains a piston 26, the piston rod link l5 of which is pivotally connected at It to lever 6 for actuating same.

The cylinder 16 is provided with ports and air 20 lines 21 and 28, respectively, from three-way valve 30 which in turn is connected to a pipe 40 from a. source of air pressure and also to an exhaust line 38. 1

The valve 30 is provided with a plunger 3t 25 adapted to be actuated by a solenoid 31. When solenoid 31 is energized plunger 3| pulls up admitting air from 40 to tube 21 and exhausting line 28 to atmosphere at 38 to move piston 26 to right to actuate cutter 22 to project edge 23 30 thereof beyond the Wall 20 into the furnace to cut away any slag or clinker covering that may have started to form across the furnace opening of the sight tube I. I

The acute edge 23 causes cut out portions of slag and other coating to drop downwardly in the furnace without fouling the cutter or sight ube When solenoid 31 is deenergized, valve 30 reverses its seats (not shown) to allow air from to 40 to enter tube 28 and exhaust air from tube 21 to atmosphere at 38 to thereby move piston 26 to the left to retract cutter 22. The spring 5 aids in this retraction and also insures that the cutter is retracted in case of air failure. Obviously, if the air pressure failed when the cutter was in projected position and it were not retracted, it would burn up. I ,1

Terminals 38 and 39 are connected as shown to a motor energized contact 42 and a source of current 43. A cam 44 adapted to open and close contact 42 at each rotation is drivingly connected to a motor 45 whereby the cutter is actuated once every fifteen minutes or other suitable period.

The cutter 22 and operating mechanism therefor in no way interferes with the supervisory function of the radiation receiver.

The cutter 22 may be manually operated from lever B by removing the readily removable pin H.

The advantages as well as the operation of the aforedescribed apparatus will be apparent without further detail.

I am aware that many changes may be made and details varied without departing from the principles of my invention and I therefore do not wish to be limited to the details shown and described.

I claim:

1. In an apparatus of the character described, the combination of a furnace wall provided with a sight tube therein, a radiation sensitive device mounted for receiving radiations through said tube and an annular cutting member iitted within said tube adapted to project inwardly beyond the surface of the wall to clear said tube.

2. The combination as expressed in claim 1 with the cutting edge of said cutting member being formed in a plane at an acute angle to the axis of the cutting member and tube with the forward edge at the top to prevent fouling of the cutting member or tube by cut away material.

3. The combination as expressed in claim 1 with the cutting edge of said cutting member irregularly formed so as to prevent fouling thereof by cut away material.

4. In an apparatus of the character described, the combination of a furnace wall provided with a sight tube therein, a radiation sensitive device mounted for receiving radiations through said tube, an annular cutting member fitted within said tube adapted to project inwardly beyond the surface of said wall to clear said tube and means for reciprocating said cutting member.

5. In an apparatus of the character described, the combination of a furnace wall provided with a sight opening therein, a radiation sensitive device mounted for receiving radiations through said opening, said mounting including a sight tube in said opening, and a cutting tube slidably fitted in said first tube and adapted to project inwardly beyond the surface of said wall to clear said opening.

THEODORE A. COHEN. 

